Brown spots on leaves

Normally happens to me, if the plants get to much light.

Phosphorus Deficiency because the spot looks a little blue or red check the soil PH to be sure if PH is good.. Then is calcium

Coco grower here! So as GreenHarvest mentions, it could definitely be calcium deficiency, but the spots look a bit off. I can see in your diary that your leaves are wet, really try and avoid getting any of your feeding water on the plant itself as that can cause damage. However overall when growing in coco you will need to feed micro and macro nutrients properly with each watering as the medium doesn’t have anything in it. I use Plagrons bottled coco line for example as you can see in my diaries. You should also add calmag with every feeding, as the coco will “steal” calcium so there need to be enough to satisfy both the coco and be left over by the plant. I actually ran into some early calcium issues shown by some leaf mutations, but that was fixed with a watering of only calmag water instead of their regular feed. Hope this helps and best of luck 💪🏽

It might be a calcium deficiency but the spots aren't usually like that and the tips are usually burnt. Take a couple more pics and add if it appears on every leaf or not bedause it might be the development of fungus. This might be the case if you water on your leaves rather than directly in the soil